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// Kontakt erstellen
const response = await fetch('https://api.entracrm.de/v1/contacts', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    first_name: 'Max',
    last_name: 'Mustermann',
    email: 'max@example.com',
    company: 'Musterfirma GmbH'
  })
});

const contact = await response.json();
console.log('Kontakt erstellt:', contact.id);